Mortar baseplate and shaduf: what they have in common

1. Step 1. Mortar baseplate — is part of — Mortar (weapon). It transfers the recoil to the ground.
2. Step 2. Mortar (weapon) — uses — Universal gravitation. The bomb flies on a steep trajectory.
3. Step 3. Universal gravitation — is used in — Plumb bob. The string hangs vertical.
4. Step 4. Plumb bob — has part — Rope. A suspension fibre.
5. Step 5. Rope — is used in — Well. Water was raised with a bucket on a rope.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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